Has anyone made an LED driver based on LM3463 6 channel driver IC?

[oreo57]

There's no problem with the WB of my photo? Must be your eyes...... You need to get them checked.:lol2:

well maybe I just like this green one..

 

[oreo57]

LOL- I think I have about 6 hours of time invested in those. 2 hours here, 2 hours there, it starts to add up quickly. Built another 10 last night, just for the sake of having some ready for the next request.

so it finally happened.. US labor cheaper than in Mumbai...
:uhoh2:

 

[O2Surplus]

so it finally happened.. US labor cheaper than in Mumbai...
:uhoh2:

LOL - Not quite, it's only possible to build these cheaply because I'm back to only working 12 - 14 hours a day, Monday through Thursday. Friday's are my day off to do whatever I want. If I want to solder up a few PcB's, crank some Rammstein & drink a few beers to relax, that's what I like to do. I don't consider it work, so I don't charge for my time.
:beer:

 

[007Bond]

Hey O2,... do you recall my pcb's,... they were to be used for 1400ma output, and I changed some rsense resistors to get a few 700ma boards. Can I make another resistor change for a 3A output channel on one of the boards? Thanks,---Rick

 

[rott]

hi 007 what are you rung at 3A ? your multi chan LED ? but I believe you can run them up to 3A but that is its top end you will need o provide some type of cooling

 

[maramao]

O2 i cant send pm

 

[O2Surplus]

Hey O2,... do you recall my pcb's,... they were to be used for 1400ma output, and I changed some rsense resistors to get a few 700ma boards. Can I make another resistor change for a 3A output channel on one of the boards? Thanks,---Rick

3 amps? That's gonna be tough. You'll have to refer to the Allegro design spread sheet to figure out what component values you'll need. The Rsense resistor, inductor, schottky diode, & "T-on" resistor will all have to replaced with different values and upgraded current capacities. IIRC the inductor you have now is only rated for 2 amps max. The schottky's good for 3 max. Even if you can find the parts, how are you going to keep it cool???

 

[O2Surplus]

O2 i cant send pm

You need to get your post count up before you can PM me. If you have a question- just ask me here in this thread. I pop in and out of this forum all day long, so I'll respond to you asap.

 

[rott]

didn't know he had to change out all the different parts glad I am at 1.4 and staying.. he could always cool it down with a cold beer

 

[O2Surplus]

didn't know he had to change out all the different parts glad I am at 1.4 and staying.. he could always cool it down with a cold beer

I consider the 3 amp rating of the chip a bit misleading. Sure- it can do 3 amps if you're only driving an led with a Vf of 12V or less from a 48V supply. It'll run hot but it's not impossible. Try the same scenario with a 36V led and the chip will run over 200 C in no time flat. I suppose if you like warm beer it's doable.

 

[oreo57]

I consider the 3 amp rating of the chip a bit misleading. Sure- it can do 3 amps if you're only driving an led with a Vf of 12V or less from a 48V supply. It'll run hot but it's not impossible. Try the same scenario with a 36V led and the chip will run over 200 C in no time flat. I suppose if you like warm beer it's doable.

Thermal Budgeting
The A6211 is capable of supplying a 3 A current through its
high-side switch. However, depending on the duty cycle, the
conduction loss in the high-side switch may cause the package to
overheat. Therefore care must be taken to ensure the total power
loss of package is within budget. For example, if the maximum
temperature rise allowed is ΔT = 50 K at the device case surface,
then the maximum power dissipation of the IC is 1.4 W. Assuming
the maximum RDS(on) = 0.4 Ω and a duty cycle of 85%, then
the maximum LED current is limited to 2 A approximately. At a
lower duty cycle, the LED current can be higher.

I'll leave the translation into human speek to you.........

For discussion...

http://www.digikey.com/rdl/4294959899/4294959833/952

cute Evaluation board..$103.. how much in SOCAL Mumbai???

I suppose I should at least ask a question..
does this imply you can "easily" run it at 3A "IF" you limit it to say 50% duty cycle???
Does a high current yet "dimmed" output offer any advantages??
Besides the disadvantage of someone wanting it to go to "11"...
Sorry just "thinking'...

 

[O2Surplus]

I'll leave the translation into human speek to you.........

For discussion...

http://www.digikey.com/rdl/4294959899/4294959833/952

cute Evaluation board..$103.. how much in SOCAL Mumbai???

I suppose I should at least ask a question..
does this imply you can "easily" run it at 3A "IF" you limit it to say 50% duty cycle???
Does a high current yet "dimmed" output offer any advantages??
Besides the disadvantage of someone wanting it to go to "11"...
Sorry just "thinking'...

LOL- I just spent almost an hour playing with Allegro's design tool for this chip. According to the datasheet, thermal shutdown protection is triggered at 165C. Running the design tool for a 3A output with a 48V input voltage and a 40V load (40V is maximum load when accounting for the required "20% supply voltage headroom" in the datasheet) yields a junction temp of around 220C. Meaning- unless you like your leds to "blink" off and on at regular intervals, very effective heat removal schemes will need to be employed to keep the chip's temp under the 165C threshold. This excessive heat situation does get better if one limits the led load to a vf of 24V or less. This yields around a 51% duty cycle and a junction temp of 153C. An led vf around 12V (26% duty cycle) keeps things even cooler at an estimated junction temp of 104C. So yeah- You can get 3A if you want it, but for other than driving a string of 4-6 Cree XM-L's at full power, I can't imagine what other led could fit that particular voltage/current scenario.

 

[oreo57]

I can't imagine what other led could fit that particular voltage/current scenario.

almost any 1-3W LEd in a 7x4 series/parallel array..
your thinking linear..

 

[007Bond]

LOL,...not going to be buying all new parts and changing things out. I wanted to know what I could get away with by just change a rsense resistor.(just food for thought) I seen the led sale site that says it would build any combination of leds 100-200-300 watters.
Question got some thought going here again:lol::thumbsup:

 

[PufferGhoti]

Trying to run O2Surplus Board Typhon

Trying to run O2Surplus Board Typhon

So far so good, need to add the I2CKeypad; Sorry about the pictures... Blackberry is a poor camera and not enuff beer to steady the hand!

 

[perkint]

Does a high current yet "dimmed" output offer any advantages??

Nope. An LED driven at 1.5A 100% PWM will output more light than the same LED driven at 3A 50% PWM. And the one run at 3A will be putting out more heat (never mind the extra heat from the driver)...

Tim

 

[maramao]

A6211 jump driver

A6211 jump driver

I tried to draw the pcb but the result is bad :uhoh3:

 

[O2Surplus]

I tried to draw the pcb but the result is bad :uhoh3:

View attachment 288950

Why's the LDD-H footprint included? Are you trying to make a version of my A6211/LDD-H replacement driver that includes 4 different current settings? or Are you trying to design a small single channel driver similar to my 5 channel design. Let me know what your after and I'll help you with the design work.

 

[maramao]

I want to do all 2 versions

 

[maramao]

In reality i would make a standalone version of your 5 channels with jamper and a lld-h replacement without jamper, because i believe that is not possible in a small space